Preheat oven: Preheat your oven to 400°F (200°C).

Prepare soufflé dishes: Butter four 6-ounce soufflé dishes and dust with cocoa powder.

Whisk egg yolks: In a large bowl, whisk together egg yolks and sugar until light and fluffy.

Add dry ingredients: Gradually whisk in the flour, cocoa powder, milk, melted butter, and salt.

Beat egg whites: In a clean bowl, beat egg whites and cream of tartar until stiff peaks form.

Fold egg whites: Gently fold egg whites into the chocolate mixture until just combined.

Divide batter: Divide the batter evenly among the prepared soufflé dishes.

Bake: Bake in the preheated oven for 20-25 minutes, or until puffed and set.

Serve immediately: Serve the soufflés immediately while still hot and puffy.

Enjoy your elegant chocolate soufflés!

Tips:

For a richer flavor, use dark chocolate cocoa powder.

For a lighter texture, use room temperature eggs.

Serve the soufflés with a dollop of whipped cream or a scoop of vanilla ice cream.